Product picture - Aquatica 18708 Zoom Gear for Canon 16-35mm f 2.8L USM & 17-40mm f 4L in Lens Port on Underwater Housing Aquatica, 18708, Zoom, Gear, Canon, 16-35mm, f, 2.8L, USM, &, 17-40mm, f, 4L, Lens, Port, on, Underwater, Housing Click the image to close this page